Questions follow Wes Welker's mental health. He suffered two concussions last season, and Sunday the receiver prepped for his second Broncos training camp by riding in an F-16 with the Air Force Thunderbirds in Cheyenne.

Pulling nine G's before two-a-days? Is he thinking straight?

"It was a great experience," Welker said before a Monday morning workout. "I don't know if I'd necessarily need to do it again. I took a selfie that actually came out pretty well. And I kept my lunch down. It wasn't easy. Near the end, we were flying by the strip, and I was like, 'OK, land already. I am good.' "

"For me it's all about my health," he said. "If I feel good, I will keep on playing."

He remains a beacon of fitness. His workouts include not only physical exertion but mental calisthenics. He said Monday he plays online brain games, similar to Luminosity, exercises he discovered through Patriots quarterback Tom Brady's TB12 Sports Therapy Center.

"When you are sound and strong physically, it gives you the courage and strength to know you can take hits," Welker said. "Some things you can't avoid. But there are things you can do to help yourself. The brain is a muscle too. You have to strengthen it. It's amazing how much better you can get from doing the exercises repeatedly."

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Safety Hagg to retire.Eric Hagg, a third-year NFL safety, notified the Broncos he plans to retire. Hagg, 24, played at Nebraska before he became a seventh-round pick of the Cleveland Browns and Tom Heckert, their general manager at the time, in the 2011 draft.

Hagg played in 11 games as a rookie and 12 in his second season of 2012, including four as a starter. However, the Browns cleaned house after the 2012 season. Heckert became the Broncos' director of pro personnel, while Hagg was waived by the Browns before the 2013 season.

The Broncos signed Hagg to a futures contract in January. His retirement would leave the Broncos with 88 players on their 90-man preseason roster.

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